I made a tutorial for open source maps with vector tiles. The result is a slippy map of American rivers and some pretty static maps of every US river. But my real goal is the tutorial source code, to help other developers learn to make their own vector maps from geographic data.
Tweetchive is a little web hack I made to show your past tweets in various views. The primary view is a map, there are also views of pictures and text and links. It's not really a finished product, but it's useful enough I launched it. [more inside]